ASTM A252 Qib 1 Ob chav -Sided Submerged Arc Vuam (DSAW) Hlau Yeeb Nkab
Lub ntsiab lus tseem ceeb
ASTM A252 Qib 1 DSAW (Ob chav -Sided Submerged Arc Welded) steel yeeb nkabyog qhov nkag- qib qib rau cov yeeb nkab steel siv hauv lub hauv paus thiab cov qauv siv. Cov txheej txheem tsim khoom no yog tsim tshwj xeeb rauloj- txoj kab uas hla, tuab- phab ntsa kavuas ua haujlwm ruaj khov-cov tswv cuab lossis ua lub plhaub rau cam khwb cia- hauv - tso cov pob zeb ua vaj tse hauv cov haujlwm tsim kho .
Qhov tseem ceeb sib txawv:DSAW yog cov txheej txheem vuam tshwj xeebsiv los tsim cov kav dej raws li ASTM A252 specification, nrog rau lwm txoj hauv kev xws li ERW (Electric Resistance Welded), LSAW (Longitudinal Submerged Arc Welded), thiab SSAW (kauv Submerged Arc Welded).
Lub npe piav qhia
| Ib feem | Lub ntsiab lus |
|---|---|
| ASTM | ASTM International (American Society for Testing and Materials) |
| A252 | Standard specification rau welded thiab seamless steel yeeb nkab pawg |
| Qib 1 | Qib qis zog, nrog qhov tsawg kawg nkaus lub zog ntawm 30,000 psi (205 MPa) |
| DSAW | Muab ob npaug rau-Sided Submerged Arc Vuam - ob qho tib si sab hauv thiab sab nraud welds yog siv, siv ib feem ntawm lwm yam los ua ib qho siab - zoo weld nugget |
Cov yam ntxwv tseem ceeb ntawm DSAW Manufacturing
| Feature | Kev piav qhia |
|---|---|
| Vuam txheej txheem | Lub vuam arc yog submerged hauv granular flux; ob sab hauv thiab sab nraud welds yuav tsum tau, feem ntau nyob rau hauv cov txheej txheem sib cais |
| Txoj kev tsim | Ob txoj hauv kev tseem ceeb:Pyramid Rolls(lub tog raj kheej tsim ntawm peb yob) los yogUAE(U-ing, O-ing, thiab Expanding) |
| Txias Expansion | Cov yeeb nkab yuav raug nthuav tawm mus txog 1.5% kom ua tiav OD kawg; Cov txheej txheem no tuaj yeem ua kom muaj zog tawm los |
| Raw Khoom | Pav ca hlau phaj (tsis yog coils), tso cai rau cov phab ntsa tuab thiab loj dua |
| Hom Loj Loj | 18" rau 72" OD(457 mm txog 1829 mm); phab ntsa thickness ntawm 0.250 "mus rau 1.5" (6.35 hli mus rau 38.1 hli) |
| Ntev | Ob chav random ntev; kev cai ntev muaj |
Chemical Composition (ASTM A252 Qib 1)
| Element | Ntau tshaj % | Sau ntawv |
|---|---|---|
| Cov pa roj carbon (C) | 0.26% | Muab qhov yooj yim zog |
| Manganese (Mn) | 1.35-1.60% | Txhim kho lub zog |
| Silicon (Si) | 0.45% | Deoxidizer |
| Phosphorus (P) | 0.050% | Yuav tsum tau txwv siab tshaj plaws |
| Sulfur (S) | 0.030% | Tswj rau weldability |
Lus Cim: ASTM A252 tsuas yog txwv qhov siab tshaj plaws rau phosphorus thiab sulfur. Tus qauv tsom rau cov khoom siv kho tshuab ntau dua li cov tshuaj lom neeg nruj.
Mechanical Properties
| Qib | Yield zog (min) | Tensile zog (min) | Elongation (min) | Lub zog vs. Qib 1 |
|---|---|---|---|---|
| Qib 1 | 205 MPa (30,000 psi) | 345 MPa (50,000 psi) | 30% | Lub hauv paus |
| Qib 2 | 240 MPa (35,000 psi) | 415 MPa (60,000 psi) | 25% | +17% tawm |
| Qib 3 | 310 MPa (45,000 psi) | 455 MPa (66,000 psi) | 20% | +51% tawm |
* Qib 1 yog qhov kev xaiv pheej yig tshaj plaws, haum rau lub teeb -load daim ntaub ntawv thiab cov av zoo .*
Dimensional Tolerances
| Parameter | Ua siab ntev |
|---|---|
| Sab nraud txoj kab uas hla | ± 1% ntawm OD |
| Phab ntsa Thickness | -12.5% ntawm nominal (tsawg kawg phab ntsa) |
| Qhov hnyav | +15% / -5% ntawm qhov hnyav theoretical |
| Ntev | Kev cai; ob chav random lengths raug |
Kev xeem yuav tsum tau
| Hom kev xeem | Kev xav tau | Sau ntawv |
|---|---|---|
| Tshuaj ntsuam xyuas | Rau qhov kub ntau | Phosphorus thiab sulfur txwv txwv |
| Tensile Test | Rau ntau | Txheeb xyuas qhov tawm los thiab lub zog tensile |
| Flattening Test | Yuav tsum tau | Txheeb xyuas qhov ductility thiab weld kev ncaj ncees |
| Hydrostatic Test | Tsis xav tau | Piping kav dej yog ntim nrog pob zeb, tsis yog siv rau kev xa dej |
| Ultrasonic soj ntsuam | Rau weld seam | Nruam tsis siv neeg qhov tsis pom kev |
| Dimensional soj ntsuam | 100% | Raws li ASTM A252 tolerances |
DSAW vs. Lwm Txoj Kev Tsim Khoom rau A252 Qib 1
| Yam | DSAW (Ob chav -Sided SAW) | LSAW (Longitudinal SAW) | ERW (Electric Resistance Welded) | SSAW (Spiral SAW) |
|---|---|---|---|---|
| Weld Seam | Ib leeg longitudinal, welded ob sab | Ib leeg longitudinal seam | Ib leeg longitudinal seam (tsis muaj muab tub lim) | Nruam kauv seam |
| Txoj kab uas hla | 18 "mus rau 72" | 12 "mus rau 64" | Mus txog 24 " | 8" rau 120" + |
| Phab ntsa Thickness | Txog li 1.5 "(38mm) | Txog li 2.5 "(63.5mm) | Nruab nrab | Txog li 1.0 "(25.4mm) |
| Raw Khoom | Hlau phaj | Hlau phaj | Hlau kauj | Hlau kauj |
| Daim ntawv thov | Loj - txoj kab uas hla piling, hnyav loads | Loj - txoj kab uas hla | Me me txoj kab uas hla | Loj heev diam piling |
| Weld Zoo | High (ob tog welded) | Siab | Zoo | Zoo |
Cov ntawv thov siv
| Daim ntawv thov | Kev piav qhia |
|---|---|
| Lub Teeb Txheej Txheem Txheej Txheem | Cov tsev nyob thiab cov tsev lag luam me |
| Cov av zoo | Qhov twg muaj peev xwm tsawg dua lossis sib npaug li 120 kN / m² |
| Ib ntus Shoring | Kev txhawb nqa excavation thiab cov qauv ib ntus |
| Lub Hom Phiaj General | Tsis yog- qhov tseem ceeb load- cov ntawv thov |
| Piling rau Me Choj | Cov choj tsis muaj kev thauj khoom loj |
| Marine Structures (Tsis yog- tseem ceeb) | Lub teeb docks, piers nyob rau hauv cov dej ntsiag to |
| Foundation Piles | Raws li kev thauj mus tas li- nqa cov tswv cuab lossis cov pob zeb pob zeb |
Qhov tseem ceeb ntawm DSAW Manufacturing
| Qhov zoo | Kev piav qhia |
|---|---|
| Loj Loj Muaj peev xwm | Ua cov kav dej los ntawm 18 "mus rau 72" OD - zoo tagnrho rau loj - txoj kab uas hla |
| Phab ntsa tuab | Haum rau hnyav - daim ntawv thov uas xav tau cov phab ntsa tuab (txog 1.5 ") |
| High Weld Integrity | Muab ob npaug rau-sided vuam tsim kom muaj zog, siab- zoo vuam seam |
| Nce yield zog | Txias expansion txheej txheem tuaj yeem ua kom muaj zog tawm los |
| Dimensional raug | Mechanical expansion ncav cuag nruj tolerances |
| Flexible forming Methods | Pyramid Rolls lossis UOE cov txheej txheem muaj |
Kev txiav txim siab tseem ceeb
1. Qib 1 vs. Qib Siab
Qib 1yog covkev lag luam feem ntaukev xaiv rau lub teeb -load daim ntawv thov
Qib 2yog qib feem ntau siv rau kev piling
Qib 3yog rau hnyav -load daim ntawv thov uas xav tau lub zog siab tshaj plaws
2. Tsis tas yuav tsum kuaj Hydrostatic
ASTM A252 ua tautsis yogyuav tsum tau kuaj hydrostatic vim hais tias cov kav dej piling tau ntim nrog cov pob zeb thiab tsis siv rau cov kua xa tawm
Qhov no txawv ntawm cov yeeb nkab siab xws li API 5L lossis ASTM A53
3. Weld Zoo
DSAW produces aib leeg siab -zoo weld nuggetlos ntawm kev sib xyaw ua ke ntawm sab hauv thiab sab nraud welds
100% ultrasonic soj ntsuam ntawm vuam seam yog tus qauv xyaum
4. Txheej txheej xaiv
Dub (dawb): Standard tiav
FBE (Fusion Bonded Epoxy): Kev tiv thaiv corrosion
Coal Tar Epoxy: Marine ib puag ncig
Bituminous txheej: Kev pabcuam faus
Galvanized: Kev siv sab nraum zoov
5. Xaus tiav
Plain xaus: Txheem rau feem ntau daim ntawv thov
Beveled xausTom ntej: 30℃bevel welding
Tsav khau / pawg lus qhia: Xaiv tau rau kev tsav tsheb nyuaj
6. Mill Test Certificate
Feem ntau muab raws liEN 10204 Hom 3.1Bnrog tag nrho cov kev xeem
Thib peb-kev tshuaj ntsuam xyuas (SGS, BV, Lloyds) muaj nyob rau ntawm kev thov
Cov ntsiab lus
ASTM A252 Qib 1 Ob chav -Sided Submerged Arc Welded (DSAW) steel yeeb nkabyog qhov nkag - theem specification rau loj - txoj kab uas hla steel yeeb nkab piles siv nyob rau hauv lub hauv paus tsim. Nrog yam tsawg kawg nkaus tawm lub zog ntawm30,000 psi (205 MPa)thiab tensile zog ntawm50,000 psi (345 MPa), Qib 1 yog qhov kev xaiv pheej yig tshaj plaws, haum rau lub teeb -load daim ntaub ntawv, cov av zoo, thiab cov qauv ib ntus.
Cov yam ntxwv tseem ceeb ntawm DSAW manufacturing:
Tsim cov kav dej los ntawm18" rau 72" ODnrog phab ntsa thickness mus txog1.5" (38 hli)
Ob -sab vuam (sab hauv thiab sab nraud) tsim ibib leeg siab -zoo weld nugget
Tsim los ntawm cov pav ca steel phaj sivPyramid Rolls lossis UOEtxoj kev
Kev nthuav dav txias txog li 1.5% ua tiav qhov kawg ntawm qhov ntev thiab tuaj yeem ua kom muaj zog tawm los
Kev siv ntau:
Lub teeb structural foundations rau cov tsev nyob / lag luam
Kev them nyiaj yug ib ntus shoring thiab excavation
Piling rau cov choj me me hauv cov av zoo
Tsis yog- cov qauv marine tseem ceeb
Thaum ordering, qhia:ASTM A252 Qib 1, DSAW (ob npaug -sided submerged arc welded), Loj (OD x WT), Ntev, Xaus Xaus, thiab cov txheej txheem txheej txheem. Rau feem ntau cov kev siv piling,Qib 2yog qib uas feem ntau pom zoo.
